[SciPy-Dev] ndimage reflect mode

[Warren Weckesser]

On Mon, Nov 3, 2014 at 1:31 PM, Matthew Brett <matthew.brett at gmail.com>
wrote:

> On Fri, Oct 31, 2014 at 12:16 AM, Matthew Brett <matthew.brett at gmail.com>
> wrote:
> > Hi,
> >
> > Sorry if this is a dumb question, but I just noticed some behavior of
> > scipy.ndimage that surprised me:
> >
> > In [63]: oned = np.arange(1, 10, dtype=float)
> > In [64]: scipy.ndimage.affine_transform(oned, [1], [-2], mode='reflect')
> > Out[64]: array([ 2.,  1.,  1.,  2.,  3.,  4.,  5.,  6.,  7.])
> >
> > OK so far.  But this I was surprised by:
> >
> > In [68]: scipy.ndimage.affine_transform(oned, [1], [-2 - 1e-15],
> mode='reflect')
> > Out[68]: array([ 2.,  1.,  2.,  2.,  3.,  4.,  5.,  6.,  7.])
> >
> > Why did the third value turn from a 1 into a 2?  I am missing something
> obvious?
>
> I assume for lack of answers that this is a bug?
>
> Any objections to opening this as an issue?
>
>

No, please do.

Warren



> Matthew
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